Open AccessSteered molecular dynamics investigation of force-induced detachment of adsorbed single polymer chains
Author(s) -
Yu Wang,
Linxi Zhang
Publication year - 2008
Publication title -
wuli xuebao
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 0.199
H-Index - 47
ISSN - 1000-3290
DOI - 10.7498/aps.57.3281
Subject(s) - chain (unit) , molecular dynamics , materials science , dynamics (music) , ideal (ethics) , polyethylene , polymer , spring (device) , physics , mechanics , thermodynamics , composite material , philosophy , epistemology , quantum mechanics , astronomy , acoustics
The dynamics of the detachment of single polyethylene (PE) chain from a strongly adsorbing surface in vacuum is investigated by steered molecular dynamics method. When the chain is pulled from the monomer of N/3 (here N is the chain length), there are two force plateaus for the curve of the average force 〈f〉 probed by the ideal spring as a function of pulling distance Zwhich agrees well with the experimental results. There are four different stages during the detachment of single polyethylene (PE) chains. As the chains are pulled in an inclined direction from one end, there exist always a linear relationship for average force probed by the ideal spring vs inclination angle θ for θ>20 degrees Furthermore, the slope of the line increases with the pulling velocity. However, for θ<20 degrees, the average force probed by the ideal spring tends to a fixed value of 780pN.